T. Tsonev

This is a good question. Ideally, the Spreadsheet helper will take a Workbook reference directly.
But this would require introducing a dependency to Telerik.Web.Spreadsheet and all assemblies required by it (which are a whole lot).

We're still pondering on how to solve this. Perhaps a third assembly, say Telerik.Web.Spreadsheet.Model, containing only the model interface definitions will solve this.
There might be some breaking changes regarding this, but we haven't made a decision yet.

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